Shortened egg reappearance periods of equine cyathostomins following ivermectin or moxidectin treatment: morphological and molecular investigation of efficacy and species composition

•Styrongylid egg reappearance periods were 5 weeks following ivermectin or moxidectin treatment.•Efficacy against adult cyathostomins was >99% for both drugs 2 weeks post-treatment.•Efficacy against luminal L4s was <85% for both anthelmintics 2 weeks post-treatment.•Larvicidal efficacy of moxidectin was within historic ranges.•There was good agreement between morphological and metabarcoding identification methods.